if you want an animated one..try using the trail effect listed in the forums.

static is possible if you use layers and layer masks set to additive or similar

Try to be more specific in what you want..Everything is possible..you just haven't figured out a way yet..Einstein said ..he would spend 95 % of the time working out the what the problem was before he worked on the answer...so what EXACTLY are you wanting..

When in doubt..or you are lost in a Zombie apocalypse or someone is giving you a hard time..Remember one thing..... Read the Construct 2 Manual..it will save your life.:)

Not sure if something like this is anything like what you are talking about but - just to explicate how simple it is - it took about 5 minutes. And the source image is yucky with the alpha going into the border. Yet still pretty neat.

Edit: Let me know if the above is part of the effect you are going for and if so, I will put some more time into it and get those mist effects like shown in your image working.srealist2012-11-05 21:03:48